CN113520441B - Tissue imaging method and system for eliminating CT high-impedance artifact interference - Google Patents
Tissue imaging method and system for eliminating CT high-impedance artifact interference Download PDFInfo
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- CN113520441B CN113520441B CN202110885397.7A CN202110885397A CN113520441B CN 113520441 B CN113520441 B CN 113520441B CN 202110885397 A CN202110885397 A CN 202110885397A CN 113520441 B CN113520441 B CN 113520441B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 24
- 230000002980 postoperative effect Effects 0.000 claims abstract description 64
- 239000007943 implant Substances 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000002591 computed tomography Methods 0.000 claims description 103
- 238000013334 tissue model Methods 0.000 claims description 22
- 238000002513 implantation Methods 0.000 claims description 10
- 238000012800 visualization Methods 0.000 claims description 2
- 238000007794 visualization technique Methods 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 4
- 238000003379 elimination reaction Methods 0.000 claims 4
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 210000001519 tissue Anatomy 0.000 description 49
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000001356 surgical procedure Methods 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 210000004373 mandible Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise
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Abstract
The invention provides a tissue imaging method and a system for eliminating CT high-barrier artifact interference, wherein the method comprises the steps of firstly obtaining preoperative CT of a patient and postoperative CT after an implant is implanted, then deriving preoperative tissue from the preoperative CT, and deriving postoperative tissue containing the implant from the postoperative CT; and finally, accurately registering the standard implant to the position of the implant in the postoperative tissue, and accurately registering the tissue part in the postoperative tissue by using the preoperative tissue to obtain an postoperative CT image without artifact interference. The invention has the advantages of convenient and simple use, and the doctor can input the preoperative CT and the postoperative CT to obtain the postoperative CT after removing the false image, thereby being convenient for the doctor to clearly know the peripheral tissue information of the implant and accurately judge whether the position of the implant has deviation.
Description
Technical Field
The invention belongs to the technical field of image processing, and particularly relates to a tissue imaging method and a tissue imaging system for eliminating CT high-impedance artifact interference.
Background
In the clinic, there is often an implantation procedure requiring an implant to be implanted into a tissue, and there may be a certain risk if the implant is not implanted well. In short, if the implant is out of a predetermined range, it may injure surrounding important tissues such as vascular nerves and the like; on the other hand, if the three-dimensional position of the implant is not optimal in the long term, it may cause a malfunction of the vehicle and even the implant may fall off due to the failure of the combination with the tissue, which may cause damage to the patient. Therefore, after the implantation operation is completed, the doctor can take a post-operation picture of the patient to check whether the implantation position condition is in accordance with the expectation, and the imaging data is a key basis for the doctor to judge whether the implant needs to be removed or not and carry out delayed secondary implantation.
However, most of the existing implants are made of high-refractive materials (such as metal), and a lot of researches show that after the high-refractive materials are implanted into tissues, the implanted periphery of the high-refractive materials generates 'hard bunching' artifacts in CT images, and the artifacts can seriously influence the interpretation of the position of the implant and the tissues adjacent to the implant by a clinician.
In order to eliminate the artifact effect, the artifact removing processing is thought to be performed on the CT image, but the existing artifact removing methods are all based on the noise reduction processing of the noise reduction image of the calculation processing layer, and a computer engineer is required to complete the processing work, so that the clinician is difficult to understand and apply to the clinic. Furthermore, no simple and easy-to-learn software exists so far, which enables a clinician to obtain artifact-removed images from conventional CT data.
Disclosure of Invention
The present invention is directed to the above-mentioned problems, and provides a tissue imaging method and system for eliminating the artifact interference of CT high-impedance objects.
In order to achieve the purpose, the invention adopts the following technical scheme: a tissue imaging method for eliminating CT high-barrier artifact interference comprises the following steps:
s1, acquiring preoperative CT of a patient and postoperative CT after implant implantation;
s2, leading out preoperative tissues from preoperative CT (computed tomography), and leading out postoperative tissues containing the implant from postoperative CT;
s3, accurately registering the standard implant to the position of the implant in the postoperative tissue, and accurately registering the tissue part in the postoperative tissue by using the preoperative tissue to obtain an postoperative CT image without artifact interference.
In the above tissue imaging method for eliminating the interference of CT high-barrier artifact, in step S2, the preoperative tissue is derived by the following method: and reconstructing the tissue model by preoperative CT to obtain a preoperative tissue model T1, and exporting the preoperative tissue model as preoperative tissue.
In the above tissue imaging method for eliminating the interference of CT high-barrier artifact, in step S2, the postoperative tissue including the implant is derived by the following method:
A1. reconstructing the implant model for the postoperative CT to obtain an implant model T2;
reconstructing a tissue part model for postoperative CT to obtain an postoperative tissue model T3;
A2. the implant model T2 is merged with the post-operative tissue model T3 to generate a three-dimensional model T4 and exported as post-operative tissue containing the implant.
In the above tissue imaging method for eliminating the interference of CT high-barrier artifact, step S3 is specifically:
B1. accurately registering the standard implant model at the implant location of the three-dimensional model T4;
B2. the preoperative tissue model T1 is used to accurately register the tissue portions in the three-dimensional model T4 to obtain a post-operative CT image without artifact interference.
In the above tissue imaging method for eliminating CT high-barrier artifact interference, in step S1, the preoperative CT is CT data of a patient before operation for one month.
In the above tissue imaging method for eliminating CT high-barrier artifact interference, in step S1, the preoperative CT is CT data of a patient within a preoperative week.
In the above tissue imaging method for eliminating the interference of the CT high-barrier artifact, in step S1, the post-operation CT is CT data of a patient within one week after the operation.
In the above tissue imaging method for eliminating the interference of CT high-barrier artifact, in step S1, the post-operation CT is CT data of the patient within 24 hours after the operation.
In the above tissue imaging method for eliminating the interference of the CT high-barrier artifact, in step S1, the post-operation CT is the instant post-operation CT data of the patient.
A tissue imaging system for eliminating CT high-barrier artifact interference is used for outputting an artifact interference-free postoperative CT image to a user after preoperative CT based on user input is processed by the method.
The invention has the beneficial effects that: the invention is convenient and simple to use, and the doctor can input the preoperative CT and the postoperative CT to obtain the postoperative CT after artifact removal, thereby being convenient for the doctor to clearly know the peripheral tissue information of the implant and accurately judge whether the position of the implant has deviation.
Drawings
FIG. 1 is a flowchart of a method for tissue visualization to eliminate CT high-impedance artifact interference according to the present invention;
FIG. 2 is a model diagram of a preoperative tissue model T1 for a preoperative CI in accordance with the present invention;
FIG. 3 is a model diagram of an implant model T2 in post-operative CT according to the present invention;
FIG. 4 is a model diagram of a postoperative tissue model T3 in postoperative CT according to the present invention;
FIG. 5 is a model diagram of a three-dimensional model T4 incorporating the implant model T2 of FIG. 3 and the post-operative tissue model T3 of FIG. 4;
FIG. 6 is a partially enlarged view of an original post-operative CT;
FIG. 7 is a close-up view of post-operative CT treated by the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the present embodiment discloses a tissue visualization method for eliminating CT high-barrier artifact interference, which specifically includes the following steps:
s1, acquiring preoperative CT of a patient and postoperative CT after implant implantation;
s2, reconstructing a tissue model by using preoperative CT to obtain a preoperative tissue model T1 as shown in a picture 2;
reconstructing the implant model for the postoperative CT to obtain an implant model T2, as shown in figure 3;
reconstructing the tissue part model for the postoperative CT to obtain an postoperative tissue model T3, as shown in FIG. 4;
s3, combining the implant model T2 with the postoperative tissue model T3 to generate a three-dimensional model T4, as shown in FIG. 5;
s5, accurately registering the standard implant model at the implant position of the three-dimensional model T4;
and accurately registering the tissue part in the three-dimensional model T4 by using the preoperative tissue model T1, namely replacing tissues which receive artifact interference after operation by tissues which are not interfered by the artifact before operation so as to obtain a postoperative CT image without artifact interference.
The method also provides a tissue imaging system for eliminating CT high-impedance object artifact interference based on the method, when the system is put into use, a doctor only needs to prepare preoperative CT in advance, shoot postoperative CT after operation, and then input the preoperative CT and the postoperative CT into the system together to obtain an postoperative CT image without artifact interference, the tissue in the image is the preoperative tissue without artifact interference, the implant is a standard implant, but the position of the implant on the tissue is the position of the implant on the tissue in the postoperative CT, so the doctor can clearly see the position of the implant through the postoperative CT image output by the system, and thus the accurate judgment of the correctness of the implantation position is made.
Specifically, the preoperative CT may be CT data of a patient within one month before a surgery, preferably, is CT data of the patient within one week before the surgery; the post-operation CT is CT data of a patient within one week after the operation, preferably the CT data of the patient immediately after the operation, so that the patient can be immediately photographed after the implantation operation, and then the pre-operation CT and the post-operation CT are directly input into the system for the doctor to carry out position judgment on the spot so as to take out the implant in time under the condition that the position is not in accordance with the expectation.
As shown in fig. 6 and 7, fig. 6 is an enlarged partial view of the original post-operative CT taken immediately after the right mandible implant implantation surgery, showing that there are a lot of hard-banding artifacts around the implant. Fig. 7 is a partially enlarged image processed by the above-described method. The original implant (linear contour around white highlight in fig. 7) is accurately registered with the standard implant in the database (white highlight image in fig. 7); the post-operative tissue image (remaining line contours in fig. 7) is accurately registered with the pre-operative tissue (grey-white structure), and the tissue around the standard implant is the complete CT tissue without artifact interference.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although terms such as pre-operative CT, post-operative CT, pre-operative tissue, post-operative tissue, pre-operative tissue model T1, implant model T2, post-operative tissue model T3, three-dimensional model T4, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (7)
1. A tissue visualization method for eliminating CT high-barrier artifact interference is characterized by comprising the following steps:
s1, acquiring preoperative CT of a patient and postoperative CT of an implant after implantation;
s2, leading out preoperative tissues from preoperative CT (computed tomography), and leading out postoperative tissues containing the implant from postoperative CT;
s3, accurately registering the standard implant to the position of the implant in the postoperative tissue, and accurately registering the tissue part in the postoperative tissue by using the preoperative tissue to obtain an postoperative CT image without artifact interference;
in step S2, the preoperative tissue is derived by: reconstructing the tissue model by preoperative CT to obtain a preoperative tissue model T1, and exporting the preoperative tissue model T1 as preoperative tissue;
in step S2, the post-operative tissue comprising the implant is derived by:
A1. reconstructing an implant model for postoperative CT to obtain an implant model T2; reconstructing a tissue part model for postoperative CT to obtain an postoperative tissue model T3;
A2. combining the implant model T2 with the postoperative tissue model T3 to generate a three-dimensional model T4, and exporting the three-dimensional model as postoperative tissue containing the implant;
the step S3 specifically comprises the following steps:
B1. accurately registering the standard implant model at the implant location of the three-dimensional model T4;
B2. the preoperative tissue model T1 is used to accurately register the tissue portions in the three-dimensional model T4 to obtain a post-operative CT image without artifact interference.
2. The method for tissue imaging with elimination of CT high-barrier artifact interference as claimed in claim 1, wherein in step S1, the preoperative CT is CT data of a patient within one month before operation.
3. The method as claimed in claim 2, wherein the preoperative CT is CT data during a preoperative week of the patient in step S1.
4. The method for tissue imaging with elimination of interference of CT high-barrier artifacts as claimed in claim 1, wherein in step S1, said post-operative CT is CT data within one week after the operation of the patient.
5. The method for tissue imaging with elimination of interference of CT high-barrier artifacts as claimed in claim 4, wherein in step S1, said post-operative CT is CT data within 24 hours of post-operative patient.
6. The method for tissue visualization with elimination of interference of CT high-barrier artifacts as claimed in claim 5, wherein in step S1, said post-operative CT is the instant post-operative CT data of the patient.
7. A tissue imaging system for eliminating CT high-barrier artifact interference is characterized in that the tissue imaging system is used for carrying out the treatment of the tissue imaging method for eliminating CT high-barrier artifact interference according to any one of claims 1-6 on the post-operation CT based on the pre-operation CT input by a user and outputting post-operation CT images without artifact interference to the user.
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| CN112017131A (en) * | 2020-10-15 | 2020-12-01 | 南京安科医疗科技有限公司 | CT image metal artifact removing method and device and computer readable storage medium |
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| US6801646B1 (en) * | 2001-07-19 | 2004-10-05 | Virtualscopics, Llc | System and method for reducing or eliminating streak artifacts and illumination inhomogeneity in CT imaging |
| WO2006039809A1 (en) * | 2004-10-12 | 2006-04-20 | UNIVERSITé LAVAL | Method and apparatus for metal artifact reduction in computed tomography |
| CN105701778B (en) * | 2016-01-11 | 2018-04-20 | 赛诺威盛科技（北京）有限公司 | A kind of method that metal artifacts are removed in the image from CT |
| CN106909947B (en) * | 2017-03-03 | 2020-06-26 | 中南大学 | Mean Shift algorithm-based CT image metal artifact elimination method and system |
| CN107978003B (en) * | 2017-10-30 | 2021-03-30 | 东软医疗系统股份有限公司 | CT image metal artifact processing method and device |
| CN110097517B (en) * | 2019-04-28 | 2022-12-27 | 东软医疗系统股份有限公司 | Method and device for removing image artifacts |
| CN111815521B (en) * | 2020-05-27 | 2024-02-13 | 南京国科精准医学科技有限公司 | Cone beam CT metal artifact correction algorithm based on priori image |
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| CN112017131A (en) * | 2020-10-15 | 2020-12-01 | 南京安科医疗科技有限公司 | CT image metal artifact removing method and device and computer readable storage medium |
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